A massive manhunt is underway after authorities discovered a disturbing plot to assassinate police officers in Baton Rouge, Louisiana. Superintendent of the Louisiana State Police, Col. Mike Edmonson, said the plot would’ve caused “substantial harm to police in the Baton Rouge area” had the four individuals successfully carried it out.

Baton Rouge Police Chief Carl Dabadie Jr. said the plot was uncovered after a robbery Saturday shortly after midnight at a pawn shop where eight handguns and a BB rifle were stolen. Two of the handguns have yet to be recovered, he said.

Two men — Antonio Thomas, 17, and Malik Bridgewater, 20 — were arrested on firearms and burglary charges. A third, Trashone Coats, 23, was arrested and charged with illegal possession of a stolen firearm.

A fourth, whose identity isn’t known, is believed to be still at large, along with the two missing handguns, police said.

A 13-year-old boy, who wasn’t identified because he is a juvenile, was also taken into custody in connection with the pawn shop burglary, police said later in a statement.

Police said in the statement that Thomas was arrested on the roof of the pawn shop with a handgun and a BB rifle and “stated that he and three other suspects stole the firearms and were going to get bullets to shoot police.”

Dabadie said Thomas disclosed “real, credible evidence” that law enforcement officers were under a serious threat.

Since the investigation is still active and undercover officers are out in force, authorities declined to reveal anymore details, but Edmonson said the fourth suspect at this time is still at large, and all law enforcement officers remain in danger.

“Our officers have been working around the clock to get these firearms off the streets of Baton Rouge,” Dabadie stated.